TMS320x2802x, 2803x Piccolo Serial Peripheral Interface (SPI) Reference Guide
Literature Number: SPRUG71B
February 2009–Revised October 2009······················································datasheet 版本
Page 23
In 3-wire master mode, ***, SPISTEx, and SPISIMOx pins must be configured as SPI pins
(SPISOMIx pin can be configured as non-SPI pin). When the master transmits, it receives the data it
transmits (because SPISIMOx and SPISOMIx are connected internally in 3-wire mode). Therefore, the
junk data received must be cleared from the receive buffer every time data is transmitted.
----这里自发自收。因此每次发送时，必须清除从接收缓存器接收的无效数据。 这里只是发送，和接收缓存器的数据有什么关系
请了解SPI的告知
Example 4. 3-Wire Master Mode Transmit
Uint16 data;
Uint16 dummy;
SpiaRegs.***.bit.TALK = 1; // Enable Transmit path
SpiaRegs.SPITXBUF = data; // Master transmits data
while(SpiaRegs.SPISTS.bit.INT_FLAG !=1) {} // Waits until data rx’d
dummy = SpiaRegs.SPIRXBUF; // Clears junk data from itself ·······请问这里说的清除的无效数据 同上处红字，可以详细说讲解？
// bc it rx’d same data tx’d
小弟保持关注 不胜感激
